Flow Control Valve and Cylinder Apparatus Having the Same

Abstract

Inside a cartridge-type cylindrical casing ( 40 ), a meter-out inlet ( 43 ), a valve chamber ( 44 ), a rod chamber ( 46 ), and a meter-out outlet ( 47 ) are formed in that order. The rod chamber ( 46 ) and the valve chamber ( 44 ) are arranged substantially concentrically, and a check valve seat ( 53 ) is provided on an inner peripheral surface of a peripheral wall ( 44 a ) of the valve chamber ( 44 ). A check ball ( 52 ) inserted in the valve chamber ( 44 ) is urged toward the check valve seat ( 53 ) by a spring ( 54 ). A throttle valve seat ( 59 ) is provided on a leading end portion of an adjusting rod ( 45 ) screwed in the rod chamber ( 46 ), and a throttle gap (G) is formed between the throttle valve seat ( 59 ) and the check ball ( 52 ).

1 . A flow control valve, comprising:
 inside a cylindrical casing ( 40 ), a meter-out inlet ( 43 ), a valve chamber ( 44 ), a rod chamber ( 46 ) for housing an adjusting rod ( 45 ) to be advancable and retreatable in an axial direction, and a meter-out outlet ( 47 ) are communicatively connected in that order,   a throttle valve seat ( 59 ) is provided on a leading end portion of the adjusting rod ( 45 ), and the throttle valve seat ( 59 ) is communicatively connected to the meter-out outlet ( 47 ) via a communicating passage ( 60 ) inside the adjusting rod ( 45 ),   a check member ( 52 ) inserted in the valve chamber ( 44 ) is urged toward the throttle valve seat ( 59 ) by an elastic member ( 54 ), and   the throttle valve seat ( 59 ) and the check member ( 52 ) are can be moved relatively moveable by advancing and retreating the adjusting rod ( 45 ) in the axial direction, whereby adjustment of a throttle gap (G) formed between at least one of a peripheral wall ( 44   a ) of the valve chamber ( 44 ) and the check member ( 52 ) and the throttle valve seat ( 59 ) is enabled adjusted.   
   
   
       2 . The flow control valve as set forth in  claim 1 , wherein
 the rod chamber ( 46 ) and the valve chamber ( 44 ) are arranged substantially concentrically, a check valve seat ( 53 ) is provided on an inner peripheral surface of the peripheral wall ( 44   a ) of the valve chamber ( 44 ), and the check member ( 52 ) can be brought into contact with the check valve seat ( 53 ) by the elastic member ( 54 ).   
   
   
       3 . A flow control valve, comprising:
 inside a cylindrical casing ( 70 ), a meter-in inlet ( 73 ), a rod chamber ( 76 ) for housing an adjusting rod ( 75 ) to be advancable and retreatable in an axial direction, a throttle valve seat ( 89 ) arranged substantially concentrically with the rod chamber ( 76 ), and a meter-in outlet ( 77 ) are communicatively connected in that order,   a valve chamber ( 74 ) is provided in at least one of a leading end portion of the adjusting rod ( 75 ) and the rod chamber ( 76 ), and a check member ( 82 ) inserted in the valve chamber ( 74 ) is urged toward the throttle valve seat ( 89 ) by an elastic member ( 84 ), and   the check member ( 82 ) and the throttle valve seat ( 89 ) are relatively moveable by advancing and retreating the adjusting rod ( 75 ) in the axial direction, whereby adjustment of a throttle gap (G) formed between at least one of a peripheral wall ( 74   a ) of the valve chamber ( 74 ) and the check member ( 82 ) and the throttle valve seat ( 89 ) is enabled.   
   
   
       4 . The flow control valve as set forth in  claim 3 , wherein
 the valve chamber ( 74 ) is provided inside the leading end portion of the adjusting rod ( 75 ), a check valve seat ( 83 ) is provided on an inner peripheral surface of the peripheral wall ( 74   a ) of the valve chamber ( 74 ), and the check member ( 82 ) can be brought into contact with the check valve seat ( 83 ) by the elastic member ( 84 ).   
   
   
       5 . A cylinder apparatus having the flow control valve as set forth in any one of  claims 1  to  4 , wherein
 inside a housing ( 3 ) of the cylinder apparatus, a fluid actuation chamber ( 11 ,  12 ) is communicatively connected to a pressure ports (P 1 , P 2 ) via an actuation port (A 1 , A 2 ) and a supply and discharge passage ( 21 ,  22 ), and an mounting hole ( 31 ,  32 ) communicatively connected to the supply and discharge passage ( 21 ,  22 ) is opened in an outer surface of the housing ( 3 ), and the cylindrical casing ( 40 ,  70 ) is attached to the mounting hole ( 31 ,  32 ), and   the actuation port (A 1 , A 2 ) is communicatively connected to the meter-out inlet ( 43 ) or the meter-in outlet ( 77 ), and the pressure port (P 1 , P 2 ) is communicatively connected to the meter-out outlet ( 47 ) or the meter-in inlet ( 73 ).   
   
   
       6 . A cylinder apparatus having a flow control valve, comprising:
 inside a housing ( 3 ) of the cylinder apparatus, a fluid actuation chamber ( 11 ,  12 ) is communicatively connected to a pressure port (P 1 , P 2 ) via an actuation port (A 1 , A 2 ) and a supply and discharge passage ( 21 ,  22 ),   a mounting hole ( 31 ,  32 ) opened in an outer surface of the housing ( 3 ) is provided, one end portion of the supply and discharge passage ( 21 ,  22 ) is opened in a bottom surface of the mounting hole ( 31 ,  32 ), and the other end portion of the supply and discharge passage ( 21 ,  22 ) is opened in a peripheral surface of the mounting hole ( 31 ,  32 ),   a cylindrical casing ( 40 ,  70 ) is attached to the mounting hole ( 31 ,  32 ), and a leading end portion of the cylindrical casing ( 40 ,  70 ) is brought into contact with or made to approach a bottom wall ( 31   a,    32   a ) of the mounting hole ( 31 ,  32 ), and thereby, the actuation port (A 1 , A 2 ) and the pressure port (P 1 , P 2 ) are partitioned, and   valve elements ( 52 ,  53 , and  59 ) ( 82 ,  83 , and  89 ) of a flow control valve ( 35 ,  68 ) are arranged inside the cylindrical casing ( 40 ,  70 ) so that the actuation port (A 1 , A 2 ) and the pressure port (P 1 , P 2 ) can be communicatively connected to each other via the valve elements.   
   
   
       7 . The cylinder apparatus having the flow control valve as set forth in  claim 6 , wherein
 a barrel portion ( 40   a,    70   a ) of the cylindrical casing ( 40 ,  70 ) is screwed in the mounting hole ( 31 ,  32 ).